Valve-grinder.



A. ASHWORTH.

VALVE GRINDER.

APPLICATION FILED MAYZ]. 1915. 1,158,021 a Patented Oct. 26, 1915.

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APPLICATION FILED MAY 27. I915. 1,158,021 Patented 001-. 26, 1915.

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. UNITED STATES PATENT OFFICE;

ASA ASHWOBTH, 0F SALAMANCA, NEW YORK.

VALVE-GRINDER.

Application filed May 27, 1915.

To all whom it may concern:

Be it known that I, AsA ASHWORTH, a citizen of the United States,residing at Salamanca, in the county of Cattaraugus and State of NewYork, have invented certain new and useful Improvements in Valve-Grinders, of which the following, taken in connection with theaccompanying drawings, is a specification.

The invention relates to valve grinders; and the improvement consists inproviding valve grinding mechanism by means of which the valves can berapidly reciprocally rota-ted with perfect freedom of movement, thespindle for turning the valve being so centered as to tension as togrind all parts of the valve and valve seat equally thereby making aperfect fit between the two parts in the shortest possible time.

A further object is to provide grinding spindles which while having acentering pressure on the valves are so loosely held and surrounded bythe reciprocating mechanism as to constantly adapt themselves to anyinequality or inaccuracy in the valve and valve seat, thereby greatlyaiding in the quick smooth grinding of the parts. It is experimentallyfound that manual reciprocation is nearly ideal for grinding valveseats. This would of course be tedious and 'tiresome. The adaptabilitypermitted in the loosely mounted spindles gives this ideal adjustment sothat with light tension the valve and valve seat are ground to a perfectfit with the least amount of abrasion; and the invention consists in thenovel features and combinations hereinafter set forth and ciprocation ofthe racks and ninions; and

Fig. 4 is a perspective view of the driving mcchanisrnfor the racks andpinions. a portion of the frame being broken away to show the cam on oneend of the crank shaft and the attachment of the toothed. rack thereto.fig. 5 is a sectional view at line Y Y in Fig.

2 showing an elevation of one of the brack-' ets for holding one of thespindles with the toothed racks slidably supported therein atSpecification of Letters Patent.

Patented 0a. 26, 1915.

Serial NO. 30,730.

each side of the central pinion on the spindle and the means for givingtension to said spindle in holding the valve on its seat while Igrlnding. Fig. 6 is a sectional view at line Z Z in Fig. 5 showing thespindle with the pinion attached thereon and loosely mounted between thetoothed racks at each side, said racks being slidably supported with aloose fit in the supporting bracket. Fig. 7 is an enlarged perspectiveview of the end of one of the spindles showing the centering punch inthe middle of the flattened end of the spindle; .and Fig. 8 is a'planview of .the top of the valve with the groove therein showing the roundopening in the center of the groove to receive the centering punch onthe spindle end. l

Like numerals of reference refer to corresponding parts in the severalviews;

The numeral 10 designates the metal frame which supports the grindingmechathe shaft 13, the head 11 being clamped on the shaft 13 at anydesired height by'means of a suitable bolt through lugs 14, the headbeing slotted or split at 15. The opposite side of the head has thegroove16 within which the pinions 17 and 18 are 'revolubly mounted. Thepinion 18 has the cams "19 on the opposite sides thereof to form thecrank shaft, the cams 19 being surrounded bv the rings 20 which have thearms 21 ex- \tending out therefrom for pivotal attachment to the ends ofthe toothed racks 22 at each side.

The frame 10 has the slotted portion 23 extending out from the head 11,the. closed lengthwise slot 24: extending lengthwise of the'centralportion of said part 23 to receive therethrough the extension 25 on thebrackets 26, a thumb-screw 27 with washer 28 being attached to theextension 25 to hold the bracket 26 rigidly against the side of part 23of the frame 10, the thumb-screw permitting the quick adjustment ofthebracket 26 at any desired point along the slotted portion 23.

The bracket 26 has the opening 33 therein and the crosswise grooves 29in the opposite sides thereof with suitable lugs each side of thegrooves 29 to hold the racks 22 loosely and slidably in line for theirIGCIP";

rocative movement. In order to reciprocally turn the valve :1 spindle 30is provided in the bracket 26, being loosely mounted through a hole 31in the lower portion of the bracket. a. threaded opening 32 beingprovided through the upper portion of the bracket as formed by the ntralopening :3 A

' threaded nut 34 fits within the opening 32 and has the lock nut Z15thereon for holding it firmly in the adjusted position. The nut 34 has acentral lengthwise hole to permit the spindle 30 to slide verticallytherethrough. Y

1 A pinion 36 is attached to the spindle 230 within the. opening 13 inthe bracket 26 to mesh loosely in the racks 22 at each side and atension coil spring 37 is provided between the upper end of the pinion313 and the lower end of the nut 34 to give the desired pr ssure on thevalve." The nut 31 is of si iicient lengthso that it may be turned intothe threaded opening 32 to thereby give any desired tension to thespring 37 yet permitting the spindle 30 to be manually thrust upward sothat the pinion 36 escapes above the racks 22 thereby permitting thefree movement of the bracket 26 along said racks without removal of thespindle 30 and the pinion 36 attached thereto. The loose support of thepinion 36 in racks 22 and the spindle 30 in the bracket 26 permits saidspindle to adjustitself to any movement or inequality in the grinding ofthe valve, a movement which is essential to the quick and perfectgrinding of the surfaceof said valve.

In orderto center the pressure of spindle 30 on the valve, 'a-groove 38is provided in the top 39 of-the valve and has the enlarge-.

ment 40 central of said groove 38 to receive point 42 is slightly longerthan the flattened wing portions of the bit 41 each side of said pointso'that-the pressure of said bit 41 is always central of the valve top39 since it bears in the enlargement 40. The wing or flat portions ofthe bit serve only' to rotatively reciprocate the valve. Other meansmight be provided to reciprocate said valve without departing from myinvention sov long as the pressure of said bit is applied through thecentral portion thereof and not through the wing or extended-portionthereof. v

The driving gear 17 may be power driven but is preferably manuallyrotated by means of the crank'43 attached to the shaft 44 of the pinion17 so that all that is necessary to grind the multiple valves of amultiple engine, as for automobiles and other uses, is to provide thenumber of brackets 26 on the frame 10 corresponding to the number ofvalves to be ground. ad usting said brackets according to theexactrelation of the valves to one another and supporting the frame 10 at thedesired height above said valves. The spindles 30 are then manuallyinserted in the grooves .lh'. and a snllicient amount of abrasiveisplaced in the joint between the valve and the valve seat. The spindlesIll arcthen reeiprocally-rotaied by turning the crank 43 therebyrecipria-a lly moving the two racks 22 to accomplish said rotation ofthe spindles. in order to obtain the highest elliciency in grinding thevalves the tension should be adjusted as lightly as possible to producethe abrading ell'ect desired otherwise the pe-' riphery ol' the valvewill be scored and roughened instead ol smoothed and shaped to aperl'ecl lit with the valve seat.

The light tension ol' the spindle 30 on the valve and the loose holdingof said spindle in the ltltkr 22 leave the valve tree to seek a lit onthe alve seat as it is continuously reciprocally rotated by said spindleand racks. in order to obtain this continuous drive of the spindles thetwo driving racks are necessary so that one may alternate the otherwithout pause. the two cams 19 being shaped sothat the alternate drivingmovement of the racks22 is continuous.

I claim as new:

1. A valve grinder comprising aframe,

brackets on said frame having openings in line with one another therein,a spindle rotiltlVCl) mounted in each of said brackets,

elements movably contacting one. each side of said spindle in saidbrackets, and means for the alternate movement of said elements tocontinuously rotatively reciprocate said spindles.

2. A valve grinder comprising a frame,

brackets adjustably attached to said frame havingcpemngs in line withone another therein, a spindle revolubly mounted in holes through eachof said brackets, a pinionon each of said spindles within'said openingin each of said brackets, toothed racks slidably supported in" saidopenings in said bracket one each sideof said pinions to mesh therewith,and means for the alternate movement of said racks to continuouslyrotatively reciprocate said spindles.

3. A valve grinder comprising a. frame having a slot therein, bracketsadjustably attached to said frame at spaced distances in saidslot, saidbrackets having openings therein in line with one another, a' spindleloosely mounted in each of said brackets to i rotativcfy move the same,a pinion on each of said spindles within said opening in said bracket, tothed racks one each side of said pinion to loosely mesh therewith andslidably supported in the opposite walls of the openings in saidbrackets, pinions rotatively mounted on said frames, and cams one eachside of one of said pinions to alternately reciprocally move saidracksand rotatively reciprocate said spindles.

42 A valve grinder comprising a frame, brackets adjustably attached tosaidframe havin openings therein, a spindle loosely and slldably mountedin holes through each of said brackets, a pinion on each, of saidspindles within said opening-- in said bracket,

toothed racks slidably supported in said brackets on each side of saidpinions to loosely mesh therewith, an adjusting nut threaded in the holefor said spindle in the upper side of said frame having a holethere-through to receive the upper end of said pinion, a coil tensionspring between said adjusting nut andthe top of said pinion on saidspindle to thereby adjust the pressure of said spindle on the valve,said frame having said opening therein sufliciently large above saidpinion to raise said pinion free of said racks for the sidewiseadjustment 'of said bracket and spindle, and cams and gearing revolublymounted in said frame to give an alternate continuous reciprocative -2motion to said racks and rotation to said spindles.

5. A valve grinder comprising a frame, spindles rotatively mounted 'onsaid frame, means to rotatively reciprocate Said spindles, a flat bitend on each of said'spindles to engage a groove in thevalve top torotate the same, a pin central of said bit end havmg a rounded pointextending beyond said flat bit end to engage a similarly shaped openingcentral of said valve top in said groove, said fiat bit endsupported bysaid pin a spaced distance above the bottom of said crosswise groove insaid valve top to permit the adaptive leaning of said spindles in anydirection on said rounded point.

In testimony whereof I have affixed my signature in the presence of twowitnesses.

ASA ASHWORTH.

Witnesses H. A. SANDBERG, E. G. WESTMAN.

